Wow, really neat engine.
F-Zero and Mario Kart comes to mind when I play this!
Very neat, but alas, unfinished.
Still, so far, the work seems to be well thought out. I would change how big the text is in the settings menu, cause I couldn't read thetiny font size.
Anyway, if you have time, stop by the API thread and tell us how you made this.
Keep up the awesome work!!!